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arXiv · 2604.22437

Spontaneous spherical symmetry breaking of black holes with resonant hair

José Ferreira·Carlos A. R. Herdeiro·Eugen Radu·Miguel Zilhão
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Abstract

Black holes with resonant hair are static, spherical, electrically charged solutions of the Einstein-Maxwell-(gauged-)scalar system. Scalar self-interactions are mandatory for their existence. Initial dynamical studies restricted to spherical symmetry suggested stability; more recently, fully non-spherical dynamical studies revealed instabilities, at least for a particular class of self-interactions. Here, we provide a more detailed study of this instability together with a different decay channel, depending on the chosen solutions. Moreover, considering a second model, we provide evidence that the instabilities may be generic for different classes of self-interactions. We conclude these solutions are dynamically unstable and split into a bosonic lump and a bald black hole (via fission) or implode to the latter (via absorption). In both cases, the non-spherical dynamics seems to be key.

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José Ferreira, Carlos A. R. Herdeiro, Eugen Radu, Miguel Zilhão. 2026-04-24. Spontaneous spherical symmetry breaking of black holes with resonant hair. https://arxiv.org/abs/2604.22437

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